Chicken Tetrazzini Bake

1 C cooked chicken (chopped to bite size)
8 oz. cooked pasta (el dente)
1/4 C butter (room temp.)
1 can cream of chicken soup
1 C sour cream
1/2 tsp. garlic salt
1/4 tsp. pepper
1/4 C chicken broth
2 Tbl. shredded parmesan
1 C shredded Mozzarella

Mix all ingredients, and place in a greased baking dish.  Bake uncovered at 350 for 40-45 min.
Enjoy!